Study on Hot Cracking Susceptibility in Multipass Weld Metal of Ni-Base Super-Alloys

镍基高温合金多道焊缝金属热裂纹敏感性研究

• 批准号: 01550561
• 负责人: SHINOZAKI Kenji
• 金额: $ 1.79万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550561/
• 关键词: Ni-base superalloy; Solidification crack; Liquation crack; Multipass weld metal; Microsegregation; Ductility-dip crack; Reheated weld metal

This paper was carried out in order to make clear the cracking mechanism of microfissure in multipass weld metal of Ni-base super-alloys. Metallographic and fractographic examinations were performed to the fracture surface of microfissure. Moreover, the effects of P, Si and S on hot cracking susceptibilities in reheated weld metal of 70%Ni-Cr-Fe ternary alloys were evaluated in order to make clear the effects of these impurity elements on hot cracking susceptibilities in multipass weld metal of Ni-base welding rods. Main results obtained are as follows.(1) A detail fractographic examination has made clear that microfissure in multipass weld metal was liquation crack or ductility-dip crack occurring at reheated weld metal.(2) The liquation cracking susceptibilities in reheated weld metal of 70%Ni-Cr-Fe ternary alloys were too low and they increased with an increase in impurity elements. Ductility-dip cracking susceptibilities of materials containing S were much higher than those containing P and Si. Especially cracking susceptibilities of 0%Cr and 20%Cr alloys containing 0.007%S were higher than those of 5%Cr and 10%Cr alloys.(3) There was the suitable Cr content for reducing the ductility-dip cracking susceptibility because of contrary effects due to grain boundary carbide, hardness and grain boundary segregation of S.

本文旨在研究镍基高温合金多道焊缝金属显微裂纹的开裂机理。对微裂纹断口进行了金相和断口分析。此外，还研究了P、Si和S对70% Ni-Cr-Fe三元合金再热焊缝金属热裂倾向性的影响，以明确这些杂质元素对Ni基焊条多道焊缝金属热裂倾向性的影响。主要结果如下。(1)详细的断口分析表明，多道焊焊缝金属中的显微裂纹是发生在再加热焊缝金属处的液化裂纹或塑性下降裂纹。(2)70%Ni-Cr-Fe三元合金焊缝再加热后的液化开裂倾向性太低，且随杂质元素含量的增加而增加。含S材料的延性-浸渍开裂敏感性远高于含P和Si材料。特别是含0.007%S的0%Cr和20%Cr合金的开裂倾向高于5%Cr和10%Cr合金。(3)由于晶界碳化物、硬度和S的晶界偏聚的相反作用，Cr含量对降低浸轧裂纹敏感性有合适的作用。

项目成果

中尾 嘉邦,篠崎 賢二: "高温割れ感受性の検討 ーNiーCrーFe三元系合金の再熱溶接金属の高温割れ感受性に及ぼすP,Si及びSの影響(第1報)ー" 溶接学会全国大会講演概要. 46. 176-177 (1990)

Yoshikuni Nakao、Kenji Shinozaki：“热裂纹敏感性研究 - P、Si 和 S 对 Ni-Cr-Fe 三元合金再加热焊缝金属热裂纹敏感性的影响（第 1 部分）”全国焊接学会会议演讲摘要 46。 176-177 (1990)

中尾 嘉邦,篠崎 賢二: "高温割れ感受性の検討ーNiーCrーFe三元系合金の再熱溶接金属の高温割れ感受性に及ぼすP,Si及びSの影響(第1報)ー" 溶接学会全国大会講演概要. 46. 176-177 (1990)

Yoshikuni Nakao、Kenji Shinozaki：“热裂纹敏感性研究 - P、Si 和 S 对 Ni-Cr-Fe 三元合金再加热焊缝金属热裂纹敏感性的影响（第 1 次报告）”全国焊接学会会议演讲摘要 46。 176-177 (1990)

Yoshikuni NAKAO and Kenji SHINOZAKI: ""Effect of P, Si and S on Hot Cracking Susceptibilities in Reheated Weld Metals of Ni-Cr-Fe Ternary Alloys (Part 1)"" Preprints of National Meeting of J. W. S.No. 46. 176 (1990)

Yoshikuni NAKAO 和 Kenji SHINOZAKI：“P、Si 和 S 对 Ni-Cr-Fe 三元合金再热焊缝金属热裂纹敏感性的影响（第 1 部分）”J. W. S.No. 全国会议预印本

中尾 嘉邦,篠崎 賢二: "延性低下割れ感受性に及ぼすCrの影響ーNiーCrーFe三元系合金の再熱溶接金属の高温割れ感受性に及ぼすP,Si及ぼすSの影響(第2報)ー" 溶接学会全国大会講演概要. 46. 178-179 (1990)

Yoshikuni Nakao、Kenji Shinozaki：“Cr对延展性降低裂纹敏感性的影响——P、Si和S对Ni-Cr-Fe三元合金再热焊缝金属热裂纹敏感性的影响（第二次报告）”《全国会议纪要》日本焊接学会 46. 178-179 (1990)

中尾 嘉邦,篠崎 賢二: "延性低下割れ感受性に及ぼすCrの影響ーNiーCrーFe三元系合金の再熱溶接金属の高温割れ感受性に及ぼすP,Si及びSの影響(第2報)ー" 溶接学会全国大会講演概要. 46. 178-179 (1990)

Yoshikuni Nakao、Kenji Shinozaki：“Cr对延展性降低裂纹敏感性的影响——P、Si和S对Ni-Cr-Fe三元合金再热焊缝金属热裂纹敏感性的影响（第二次报告）”《全国会议纪要》日本焊接学会 46. 178-179 (1990)